Amphoe location in Ranong Province
|Coordinates: 9°35′7″N 98°35′46″E / 9.58528°N 98.59611°ECoordinates: 9°35′7″N 98°35′46″E / 9.58528°N 98.59611°E|
|• Total||657.688 km2 (253.935 sq mi)|
|• Density||29.2/km2 (76/sq mi)|
|Time zone||THA (UTC+7)|
Neighboring districts are (from the north clockwise) Mueang Ranong of Ranong Province, Phato of Chumphon Province, Chaiya, Tha Chang and Ban Ta Khun of Surat Thani Province, and Suk Samran of Ranong again. To the west is the Andaman Sea.
The southeastern part of the district is part of the Khlong Nakha Wildlife Sanctuary. The mangrove forests in the estuary of the Kapoe River are part of the Ranong Biosphere Reserve.
The district is subdivided into 5 subdistricts (tambon), which are further subdivided into 34 villages (muban). Kapoe itself is a township (thesaban tambon) and covers parts of the tambon Kapoe. There are 4 Tambon administrative organizations (TAO) responsible for the non-municipal area.